Physics (AS & A Level) · Oct / Nov 2017 · Paper 13 · Question 25
9702Doppler effect for sound waves
A source of sound of frequency F at point Z is moving at a steady speed. The pattern of the emitted wavefronts is shown. Which row describes the frequencies of the sound heard by stationary observers at X and Y?
- A<F, <F
- B<F, >F
- C>F, <F
- D>F, >F
As printed in the paper
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Correct answer: C. >F, <F
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